Revert "Customized support for feedback on calls to Array." and follow-up fixes.

src/ic.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "v8.h"
 
 #include "accessors.h"
 #include "api.h"
 #include "arguments.h"
 #include "codegen.h"
@@ skipping 483 matching lines @@
   // through the embedded maps.
   SetTargetAtAddress(address, *pre_monomorphic_stub(isolate), constant_pool);
 }
 
 
 void CallIC::Clear(Isolate* isolate,
                    Address address,
                    Code* target,
                    ConstantPoolArray* constant_pool) {
   // Currently, CallIC doesn't have state changes.
-  if (target->ic_state() != v8::internal::MONOMORPHIC) return;
-  CallIC::State existing_state(target->extra_ic_state());
-
-  // Monomorphic array stubs don't need to be cleared because
-  // 1) the stub doesn't store information that should be cleared, and
-  // 2) the AllocationSite stored in the type feedback vector is immune
-  //    from gc type feedback clearing.
-  ASSERT(existing_state.stub_type() == MONOMORPHIC_ARRAY);
+  ASSERT(target->ic_state() == v8::internal::GENERIC);
 }
 
 
 void LoadIC::Clear(Isolate* isolate,
                    Address address,
                    Code* target,
                    ConstantPoolArray* constant_pool) {
   if (IsCleared(target)) return;
   Code* code = target->GetIsolate()->stub_cache()->FindPreMonomorphicIC(
       Code::LOAD_IC, target->extra_ic_state());
@@ skipping 1296 matching lines @@
     set_target(*stub);
     TRACE_IC("StoreIC", key);
   }
 
   return store_handle;
 }
 
 
 CallIC::State::State(ExtraICState extra_ic_state)
     : argc_(ArgcBits::decode(extra_ic_state)),
-      call_type_(CallTypeBits::decode(extra_ic_state)),
-      stub_type_(StubTypeBits::decode(extra_ic_state)) {
+      call_type_(CallTypeBits::decode(extra_ic_state)) {
 }
 
 
 ExtraICState CallIC::State::GetExtraICState() const {
   ExtraICState extra_ic_state =
       ArgcBits::encode(argc_) |
-      CallTypeBits::encode(call_type_) |
-      StubTypeBits::encode(stub_type_);
+      CallTypeBits::encode(call_type_);
   return extra_ic_state;
 }
 
 
-bool CallIC::DoCustomHandler(Handle<Object> receiver,
-                             Handle<Object> function,
-                             Handle<FixedArray> vector,
-                             Handle<Smi> slot,
-                             const State& state) {
-  ASSERT(function->IsJSFunction());
-  // Are we the array function?
-  Handle<JSFunction> array_function = Handle<JSFunction>(
-      isolate()->context()->native_context()->array_function(), isolate());
-  if (array_function.is_identical_to(Handle<JSFunction>::cast(function))) {
-    // Alter the slot.
-    Handle<AllocationSite> new_site = isolate()->factory()->NewAllocationSite();
-    vector->set(slot->value(), *new_site);
-    State new_state = state.ToMonomorphicArrayCallState();
-    CallICStub stub(isolate(), new_state);
-    set_target(*stub.GetCode());
-    Handle<String> name;
-    if (array_function->shared()->name()->IsString()) {
-      name = Handle<String>(String::cast(array_function->shared()->name()),
-                            isolate());
-    }
-
-    TRACE_IC("CallIC (Array call)", name);
-    return true;
-  }
-  return false;
-}
-
-
 void CallIC::HandleMiss(Handle<Object> receiver,
                         Handle<Object> function,
                         Handle<FixedArray> vector,
                         Handle<Smi> slot) {
   State state(target()->extra_ic_state());
   Object* feedback = vector->get(slot->value());
 
-  if (feedback->IsJSFunction() || !function->IsJSFunction() ||
-      state.stub_type() != DEFAULT) {
+  if (feedback->IsJSFunction() || !function->IsJSFunction()) {
     // We are going generic.
+    ASSERT(!function->IsJSFunction() || *function != feedback);
+
     vector->set(slot->value(),
                 *TypeFeedbackInfo::MegamorphicSentinel(isolate()),
                 SKIP_WRITE_BARRIER);
-
-    State new_state = state.ToGenericState();
-    if (new_state != state) {
-      // Only happens when the array ic goes generic.
-      ASSERT(state.stub_type() == MONOMORPHIC_ARRAY);
-      CallICStub stub(isolate(), new_state);
-      Handle<Code> code = stub.GetCode();
-      set_target(*code);
-    }
-
     TRACE_GENERIC_IC(isolate(), "CallIC", "megamorphic");
   } else {
     // If we came here feedback must be the uninitialized sentinel,
     // and we are going monomorphic.
     ASSERT(feedback == *TypeFeedbackInfo::UninitializedSentinel(isolate()));
-
-    // Do we want to install a custom handler?
-    if (DoCustomHandler(receiver, function, vector, slot, state)) {
-      return;
-    }
-
     Handle<JSFunction> js_function = Handle<JSFunction>::cast(function);
     Handle<Object> name(js_function->shared()->name(), isolate());
     TRACE_IC("CallIC", name);
     vector->set(slot->value(), *function);
   }
 }
 
 
 #undef TRACE_IC
 
@@ skipping 1124 matching lines @@
 #undef ADDR
 };
 
 
 Address IC::AddressFromUtilityId(IC::UtilityId id) {
   return IC_utilities[id];
 }
 
 
 } }  // namespace v8::internal